Improvement in machines foe forming the bells of cornets



@uitrit tapes atat @fitta LEWIS W. SPENCER, CF vNEW YCEK, N. Y., ASSIGNCR TC SCHEEIBEI CORNET MANUFACTURING COMPANY.,77 0F THE SAME PLACE.

Lene/fs Patent No. 63,761, dated Apr-iz 9, 1867.

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TO ALL WHOM IT MAY CON CERN:

Be it known that I, LEWIS W. SPENCER, of the city, county, and State of New York, have invented a nei` and useful Machine for Fprmin-g the Bell of Cornets, and other like metallic musical instruments; and I, d hereby ,declare that thefollowing is a full, clear, and exact description thereof, reference being had to th. accompanying drawings, making part of this specication,l in whichi Figure 1 is a front elevation of the machine; and

Figure 2 a vertical section thereof.

The operation of forming the bell ef such instruments has heretofore been attended with serious diilicultie` and much labor; but by means of my said invention I am enabled to accomplish the required Aresult in the mos perfect manner and with very little labor.

As in the usual process generally practised, the sheet metal required to form such a bell is bent in the fern of a frnstumvof a cone, as represented by Figure 3, and they edges brazing. The small end of this hollow frustum is inserted in the central hole of the disk of lead a, and this disk placed on the upper edge of a hollow die b, which I prefer to make of steel with the inside of the form of the bell which is to be made, but shorter, al represented. This die is secured to a plate, c, which is connected with the upper surface of a bench, d, by z fulcrum-pin, e, for a purpose to be presently described. A former, f, of the form of the bell to be formed,- anc which I prefer to make of steel, is secured to the under side of a cross-head, g, with the larger end next to thi `said cross-head. This former is secured to the cross-head by a pintle, t, projecting from its upper ndpan( which is fitted to a hole of corresponding size in the cross-head, and a pin is then driven into ahole in the cross head and in the pintle. The cross-head y is adapted to slide on two vertical and parallel rods z'z', firmly con nected with the bench d, and'connected together at top by a cross-bar, j, in which isjournalled a strong nut, c so that it can turn therein without moving up or down, and to this nut is fitted a strong screw-shaft, Z, which is {irmlysecured b y its lower' end to the cross-head g. After the blank has been inserted in the die b, as beforr stated, and brought in line under the former f, the nut le is turned by any suitable power, but with a regular motion, to force down the follower into the blank; and by this downward motion of the former the blank if forced downinvto the disk of lead'a, which, resting on the upper edge of the die, is gradually forced down int( the cavity of the die and spread and its bore enlarged; but during these changes of form the lead presents suol a resistance to the sheet-metal blank that the inner surface' thereof' is forced into close contact with the former and by degrees, and, as the former descends, made to assume the exact form of the former, both outside an( inside. When the former has been forced down to the full extent, the motion of the nut is reversed, the formel drawn out, and the plate which holds the die turned out from under the former, and the formed hell taken out The machine is then ready to receive another blank. i i 1 Agood bell can be thus formed at one operation, but a more perfect result can be produced by two or three operations, and to de this I have two or three formers, the last being ofthe exact form intended to be ultimately given to the bell, and the others being only of an approximate form. v If I use three formers in succession, I subject the blank to the operation of the machine with a former which is nearest in form to the form of the`blank, and then to a like operation with the second former, which should be a mean between the rst and the last, and` finally, with the last former, which con-pletes the bell. 'In this way the metal is subjected to less strain thai when completed at one operation. The lead disk will best subserve the purpose above described if it be made thicker immediately around the central hole, and when so made I use it with the said projection upwards wher I make the bell at one operation, and downward when I form the bell by two or more operations.

What I claim as my invention, and desire to secure by Letters Patent, isp The combination of the die, the leaden (or equivalent) disk, the former, and the follower, substantially nl andfor the purpose described.

L. W. SPENCER.

Witnesses:

WM. H. BISHOP, ANDREW DmLApY. 

